The European Remote Sensing (ERS-1&2) series of satellites started with the launch of ERS-1 in 1991 and was followed in 1995 by ERS-2. Both carry several sensors which are useful for landscape monitoring: Active Microwave Instrument (AMI), Along Track Scanning Radiometer (ATSR), and a radar altimeter. The satellites have a polar, circular, sun-synchronous 782-km orbit with a 35-day repeat cycle orbit. The SAR incidence angle is 23° with a swath width of 100km, while the wind scatterometer points fore and aft 25-59° with a swath width of 500km. ATSR also has a swath width of 100km.
| Band | Frequency (GHz) | Resolution (m) |
| SAR C | 5.3 | 30 |
| Wind Scatterometer | 5.3 | 500 |
| Band | Frequency (GHz) | Vertical Resolution (m) |
| K | 13.8 | 0.1 |
| Band | Center Wavelength (µm) | Resolution (km) |
| 1 | 1.6 | 1 |
| 2 | 3.7 | 1 |
| 3 | 10.8 | 1 |
| 4 | 12 | 1 |
| 5 (ERS-2) | 0.65 | 1 |
| 6 (ERS-2) | 0.85 | 1 |
| 7 (ERS-2) | 1.27 | 1 |
ERS-1&2 data can be searched and ordered through the following:
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CHAART Sensor Evaluation page